铝镁合金中溶质分布形态的分子动力学研究  

Molecular dynamics investigation on the distribution morphology of solute atoms in Al-Mg alloy

作　　者：杜海龙[1] 陈忠家[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2011年第3期346-349,436,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(10702018)

摘　　要：文章运用分子动力学方法,模拟了三维条件下铝镁合金中刃型位错和溶质原子间的相互作用。在静态弛豫条件下,溶质原子聚集在位错线周围,其密度随着离位错线距离的增加而减小。当给体系施加一定的应变量后,溶质原子相对于位错线的偏聚效应随着应变速率的增大而减小。位错和溶质原子间的交互作用存在有效钉扎、动态应变时效和脱钉3种形式。The interaction between the edge dislocation and solute atoms in Al-Mg alloy is studied with 3D molecular dynamics simulation. Under the condition of static relaxation, the solute atoms concentrate around the dislocation line, and the density of solute atoms decreases with the increase of the distance to the dislocation line. When applying the deformation on the cell, the gathering tendency of the solute atoms to the dislocation line decreases with the increase of the strain rate. And three appearances of the dislocation-solute interaction are found, i.e. pinning, dynamic strain ageing and depinning.

关 键 词：分子动力学 位错 溶质原子 铝镁合金 

分 类 号：O344[理学—固体力学]